A language model is any model that operates on language in general. They vary in capabilities. Language recognition is one example of a language usecase.
Large language models is the class of models that are used for ChatGPT and other modern chatbots.



And this drift is only partially real. Because AI is such a hype, companies slap AI on stuff that is not what you understand under it.
And as this drift is so asymmetrical, we need to make at least clear what there is that is called AI